Products > Test Equipment

ohms issue with a Fluke 87 - solved

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istovit:
I just replaced r2 and shorted leads now measure .3 ohms.
trouble is its 1/2 watt and can't find a vendor for 2 watts 1% in quantities less than 100.
anyway its back in business,thanks for the replies.
 

bdunham7:

--- Quote from: istovit on September 23, 2021, 10:40:20 pm --- R2 is 917k,almost 8% high.....
I just replaced r2 and shorted leads now measure .3 ohms.

--- End quote ---

I think your math is off by about a factor of ten?  (917k -909k (spec) = 8k, 8k/909k = .0088 or 0.88%, within spec.

You might just put R2 back in and liberally reflow the solder in the area between R2 and the input jack because I'm pretty sure that is where your problem is/was.

istovit:

--- Quote from: bdunham7 on September 23, 2021, 10:50:10 pm ---
--- Quote from: istovit on September 23, 2021, 10:40:20 pm ---



You might just put R2 back in and liberally reflow the solder in the area between R2 and the input jack because I'm pretty sure that is where your problem is/was.

--- End quote ---

I think so too. it measured .3 ohms a few minutes after soldering r2,today its just over 2.
heating up the area could have made the improvement. back to the bench.



--- End quote ---

istovit:
if you're still reading I just took mine out of a box its been in since then,installed a new battery,and got .4 ohms with the same probes.  why does this happen?  anyway the 77 is in that box now.

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